#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#define N 30000

void main()
{
    float x,y;
    int c=0,d=0;

    while(c++<=N)
    {
        x=rand()%101;
        y=rand()%101;
        if(x*x+y*y<=10000)
            d++;
    }
    printf("pi=%f\n",4.*d/N);
}